S1 E7 ∙ Jersey War Tunnels ∙

The underground bases built by the German army during the occupation of Jersey, and a group of more than 20 underground cities in Turkey, one of which dates back to 800BC.

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All episodes for series 1 of Underground Worlds

S1 E1 · Gibraltar

Incredible feats of human endeavour, revealing what people have built, where, how and why.

S1 E3 · Switzerland

A look at some of Switzerland's 300,000 subterranean bunkers built across history.